Thread:GODLIKEUndertaker/@comment-24053170-20191017074408/@comment-29976655-20191018030432

It may not a actual character showing in the manga but they still did appeared in other series in some sort of forms (Sticker, Censoring or whatever you're referring it as). This is why I put it in Trivia section instead of made the "Appearance in Other Media" section and put that information on it, because I did acknowledge the fact the actual character never appear in that series before. So that Ikaros and Astraea stuffs is still need to put into the Trivia section, it's just we need a different words to explain it instead of "cameo".

As for Astraea cover in Plunderer, well she did featured in the manga cover but only in the alternate version of manga cover (The actual version was shown Hina in the cover). Here's the link of Asrraea cover: https://www.gamers.co.jp/shop/fair/31082/

You could argue that's Hina in Astraea's hairstyle in that alternate cover, but if you compared it to actual Hina's cover you could see there's a lot of difference in both covers (Face, breasts size and the "words" in their right leg).